AITA for giving my son's friend a haircut?

Today my 12yo boy spent the entire day with his best friend Aaron. I asked my son if he wanted to buzz his hair before his dad picked him up and I can do it while he and Aaron play video games.

When I was done with my son, I asked Aaron if he'd like to even out his bob. His hair was like Kurt Cobain's. He said no because he was going to get it short like my son's. I said I could do that instead. He said okay. I even let him put in some color.

I dropped him off a couple of hours later. Well his parents called me like they were excited. They asked why did I cut Aaron's hair. I said I know right? You can now see his eyes.

They said no. I had no business cutting his hair. I said I was surprised because Aaron is way old enough to groom his hair. They said I should had asked. I said it's hard to have a talk with people who think 12yo boys should get permission to style their hair.